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How to tell if chem film was done

Q. I recently ordered some custom machined parts with clear chem film. The vendor supplied documentation stating that they finished the parts to MIL-DTL-5541F Type I Class 3 (clear). A few of the parts, however, have a distinctly different appearance than the rest. They are brighter, shinier, and generally like unfinished aluminum. How can I tell whether these parts were really chem-filmed or not?

The parts will be used on a test fixture in an electronics factory. The conductivity of their surfaces is needed, which drove us to spec chem film instead of anodizing.

Thanks,

  

Wallace White
Mechanical Engineer - Seattle, Washington
April 26, 2010

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